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Memcached was first developed by Brad Fitzpatrick for his website LiveJournal, on May 22, 2003. Google App Engine, AppScale, Microsoft Azure and Amazon Web Services also offer a Memcached service through an API. Engine Yard and Jelastic are using Memcached as part of their platform as a service technology stack and Heroku offers several Memcached services as part of their platform as a service. Memcached was originally developed by Danga Interactive for LiveJournal, but is now used by many other systems, including MocoSpace, YouTube, Reddit, Survata, Zynga, Facebook, Orange, Twitter, Tumblr and Wikipedia. Memcached can be equally valuable for situations where either the number of requests for content is high, or the cost of generating a particular piece of content is high. Where high volume, wide audience web publishing requires it, this may stretch to many gigabytes. It is limited to available memory across all the servers in the cluster of servers in a data centre. The size of this hash table is often very large. Applications using Memcached typically layer requests and additions into RAM before falling back on a slower backing store, such as a database. When the table is full, subsequent inserts cause older data to be purged in least recently used (LRU) order. Memcached's APIs provide a very large hash table distributed across multiple machines. Memcached runs on Unix-like operating systems (at least Linux and OS X) and on Microsoft Windows. Memcached is free and open-source software, licensed under the Revised BSD license. It is often used to speed up dynamic database-driven websites by caching data and objects in RAM to reduce the number of times an external data source (such as a database or API) must be read. Memcached (pronunciation: mem-cash-dee) is a general-purpose distributed memory caching system.
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